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https://www.readbyqxmd.com/read/28432115/effects-of-exercise-on-vascular-function-structure-and-health-in-humans
#1
Daniel J Green, Kurt J Smith
Physical activity has profound impacts on the vasculature in humans. Acute exercise induces immediate changes in artery function, whereas repeated episodic bouts of exercise induce chronic functional adaptation and, ultimately, structural arterial remodeling. The nature of these changes in function and structure are dependent on the characteristics of the training load and may be modulated by other factors such as exercise-induced inflammation and oxidative stress. The clinical implications of these physiological adaptations are profound...
April 21, 2017: Cold Spring Harbor Perspectives in Medicine
https://www.readbyqxmd.com/read/28419028/physical-activity-assessment-with-the-actigraph-gt3x-and-doubly-labeled-water
#2
Andrea K Chomistek, Changzheng Yuan, Charles E Matthews, Richard P Troiano, Heather R Bowles, Jennifer Rood, Junaidah B Barnett, Walter C Willett, Eric B Rimm, David R Bassett
PURPOSE: To compare the degree to which four accelerometer metrics-total activity counts per day (TAC/d), steps per day (steps/d), physical activity energy expenditure (PAEE, kcal/kg/day), and moderate- to vigorous-intensity physical activity (MVPA, min/d)- were correlated with PAEE measured by doubly-labeled water (DLW). Additionally, accelerometer metrics based on vertical axis counts and triaxial counts were compared. METHODS: This analysis included 684 women and 611 men aged 43 - 83 years...
April 18, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28415065/acute-effect-of-biomechanical-muscle-stimulation-on-the-counter-movement-vertical-jump-power-and-velocity-in-division-i-football-players
#3
Bert H Jacobson, Taylor P Monaghan, John H Sellers, Eric C Conchola, Zach K Pope, Rob G Glass
Jacobson, BH, Monaghan, TP, Sellers, JH, Conchola, EC, Pope, ZK, and Glass, RG. Acute effect of biomechanical muscle stimulation on the counter-movement vertical jump power and velocity in division I football players. J Strength Cond Res 31(5): 1259-1264, 2017-Research regarding whole body vibration (WBV) largely supports such training augmentation in attempts to increase muscle strength and power. However, localized biomechanical vibration has not received the same attention. The purpose of this study was to assess peak and average power before and after acute vibration of selected lower-body sites in division I athletes...
May 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28414131/cyclical-corticosterone-administration-sensitizes-depression-like-behavior-in-rats
#4
Katherina A Lebedeva, Hector J Caruncho, Lisa E Kalynchuk
Because stress is a significant risk factor for depression, many animal models of depression employ chronic stress as a precipitating event. However, almost without exception, stress-induced animal models of depression focus on a single bout of depression and therefore, they do not provide any means to understand the typical cycling of mood observed in most patients with depression. Here we assessed whether repeated cycles of exposure to the stress hormone corticosterone would sensitize depression-like behavior...
April 13, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28410999/impact-of-time-and-work-rest-ratio-matched-sprint-interval-training-programmes-on-performance-a-randomised-controlled-trial
#5
Molly C Lloyd Jones, Martyn G Morris, John R Jakeman
OBJECTIVES: The aim of this study was to examine the effects of a short training intervention using two repeated sprint protocols matched for total sprint duration and work:rest ratio. DESIGN: Randomised-controlled trial. METHODS: Thirty physically active males were randomly allocated to one of two sprint training groups: a 6s group, a 30s group or a non-exercising control. The training groups were matched for work:rest ratio and total sprint time per session, and completed 6 training sessions over a 2-week period...
March 31, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28403889/muscle-mri-at-the-time-of-questionable-disease-flares-in-juvenile-dermatomyositis-jdm
#6
Rabheh Abdul-Aziz, Chack-Yung Yu, Brent Adler, Sharon Bout-Tabaku, Katherine E Lintner, Melissa Moore-Clingenpeel, Charles H Spencer
BACKGROUND: The course of JDM has improved substantially over the last 70 years with early and aggressive treatments. Yet it remains difficult to detect disease flares as symptoms may be mild; signs of rash and muscle weakness vary widely and are often equivocal; laboratory tests of muscle enzyme levels are often normal; electromyography and muscle biopsy are invasive. Alternative tools are needed to help decide if more aggressive treatment is needed. Our objective is to determine the effectiveness of muscle Magnetic Resonance Imaging (MRI) in detecting JDM flares, and how an MRI affects physician's decision-making regarding treatment...
April 12, 2017: Pediatric Rheumatology Online Journal
https://www.readbyqxmd.com/read/28402191/sand-training-exercise-induced-muscle-damage-and-inflammatory-responses-to-matched-intensity-exercise
#7
Henry Brown, Brian Dawson, Martyn J Binnie, Hugh Pinnington, Marc Sim, Tristan D Clemons, Peter Peeling
This study compared markers of muscle damage and inflammation elevated by a matched-intensity interval running session on soft sand and grass surfaces. In a counterbalanced, repeated-measures and crossover design, 10 well-trained female athletes completed 2 interval-based running sessions 1 week apart on either a grass or a sand surface. Exercise heart rate (HR) was fixed at 83-88% of HR maximum. Venous blood samples were collected pre-, post- and 24 h post-exercise, and analysed for myoglobin (Mb) and C-reactive protein (CRP)...
April 12, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28388333/blunted-myoglobin-and-quadriceps-soreness-after-electrical-stimulation-during-the-luteal-phase-or-oral-contraception
#8
Lindsey J Anderson, Lucinda L Baker, E Todd Schroeder
PURPOSE: Acute muscle damage after exercise triggers subsequent regeneration, leading to hypertrophy and increased strength after repeated exercise. It has been debated whether acute exercise-induced muscle damage is altered under various premenopausal estrogen conditions. Acute contraction-induced muscle damage was compared during exogenous (oral contraceptive, OC), endogenous (luteal phase, HI), or low (menses, LO) estrogen in healthy young women aged 21 to 30 years old. METHODS: Women (OC, n = 9; HI, n = 9; LO, n = 8; total N = 26) performed 1 neuromuscular electrical stimulation (NMES) bout...
April 7, 2017: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/28385735/prior-exercise-and-standing-as-strategies-to-circumvent-sitting-induced-leg-endothelial-dysfunction
#9
Takuma Morishima, Robert M Restaino, Lauren K Walsh, Jill A Kanaley, Jaume Padilla
We have previously shown that local heating or leg fidgeting can prevent prolonged sitting-induced leg endothelial dysfunction. However, whether physical activity prevents subsequent sitting-induced leg endothelial dysfunction remains unknown. Herein, we tested the hypothesis that sitting-induced leg endothelial dysfunction would be prevented by prior exercise. We also examined if, in the absence of exercise, standing is an effective alternative strategy to sitting for conserving leg endothelial function. Fifteen young healthy subjects completed three randomized experimental trials: 1) sitting without prior exercise; 2) sitting with prior exercise; and 3) standing without prior exercise...
April 6, 2017: Clinical Science (1979-)
https://www.readbyqxmd.com/read/28375644/physical-activity-levels-in-children-with-and-without-autism-spectrum-disorder-when-playing-active-and-sedentary-xbox-kinect-videogames
#10
Daphne Golden, Nancy Getchell
OBJECTIVE: We compare physical activity during bouts of sedentary videogaming (SVG), active videogaming (AVG), and paced walking in children with and without autism spectrum disorder (ASD) to determine the effectiveness of AVG in providing moderate-to-vigorous physical activity. MATERIALS AND METHOD: Participants included nine males (8-11 years old) with ASD and eight age-matched males who were typically developing. Both groups had anthropometric and motor proficiency (Movement Assessment Battery for Children II) measures taken before testing...
April 2017: Games for Health
https://www.readbyqxmd.com/read/28341321/reprint-of-repeated-adolescent-activity-based-anorexia-influences-central-estrogen-signaling-and-adulthood-anxiety-like-behaviors-in-rats
#11
Tien-Jui Lee, Kimberly P Kinzig
Anorexia nervosa (AN) typically presents in adolescence and is highly comorbid with anxiety and depression, which often persist after elimination of AN symptomology. The activity-based anorexia (ABA) paradigm allows for evaluation of behavioral and neuroendocrine consequences of AN-like behaviors, including voluntary anorexia, hyperactivity, and disruption of the hypothalamic-pituitary-gonadal (HPG) and the hypothalamic pituitary adrenal (HPA) axis. Because ABA in adolescent females results in increased anxiety-like behavior in adulthood and the estrogen signaling system has been shown to play a role in anxiety and food intake, we investigated the role of ovarian hormones in adolescent ABA-treated rats, and long-term effects of mid- and late adolescent ABA exposure on behavior and estrogen signaling...
March 21, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28338369/dha-rich-fish-oil-increases-the-omega-3-index-and-lowers-the-oxygen-cost-of-physiologically-stressful-cycling-in-trained-individuals
#12
Lachlan Hingley, Michael J Macartney, Marc A Brown, Peter L McLennan, Gregory E Peoples
Dietary fish oil, providing docosahexaenoic acid (DHA) modulates oxygen consumption and fatigue in animal models. However, in humans predominately supplemented with high eicosapentaenoic acid (EPA), there is no evidence of endurance performance enhancement. Therefore, this study examined if DHA-rich fish oil could improve repeated bouts of physiologically stressful cycling and a subsequent time trial in a state of fatigue. Twenty-six trained males took part in a double-blind study and were supplemented with either 2x1g/day soy oil (Control) or DHA-rich tuna fish oil (Nu-Mega) (FO) (560mg DHA / 140mg eicosapentaenoic acid (EPA)) for eight weeks...
March 24, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28326310/cardiopulmonary-response-during-whole-body-vibration-training-in-patients-with-severe-copd
#13
Rainer Gloeckl, Petra Richter, Sandra Winterkamp, Michael Pfeifer, Christoph Nell, Jeffrey W Christle, Klaus Kenn
Several studies in patients with chronic obstructive pulmonary disease (COPD) have shown that whole-body vibration training (WBVT) has beneficial effects on exercise capacity. However, the acute cardiopulmonary demand during WBVT remains unknown and was therefore investigated in this study. Ten patients with severe COPD (forced expiratory volume in 1 s: 38±8% predicted) were examined on two consecutive days. On day one, symptom-limited cardiopulmonary exercise testing was performed on a cycle ergometer. The next day, six bouts of repeated squat exercises were performed in random order for one, two or three minutes either with or without WBVT while metabolic demands were simultaneously measured...
January 2017: ERJ Open Research
https://www.readbyqxmd.com/read/28324755/sedentary-behavior-different-types-of-operationalization-influence-outcome-measures
#14
Malou H J Fanchamps, Hendrika J G van den Berg-Emons, Henk J Stam, Johannes B J Bussmann
INTRODUCTION: Sedentary behavior (SB) influences health status independently of physical activity. The formal definition of SB is: "any waking behavior characterized by an energy expenditure ≤1.5 METs while in a sitting or reclining posture". However, measuring SB mostly does not include both the intensity and postural component. The aim of this study was to quantify the effect of type of operationalization of SB on total sedentary time and the pattern of SB. METHODS: 53 healthy subjects were measured 24h with a multi-sensor activity monitor that provides a valid one-second detection of body postures and movements and a calculated intensity measure...
March 6, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28324168/the-effect-of-eccentric-exercise-with-blood-flow-restriction-on-neuromuscular-activation-microvascular-oxygenation-and-the-repeated-bout-effect
#15
Jakob D Lauver, Trent E Cayot, Timothy Rotarius, Barry W Scheuermann
PURPOSE: To examine the effect of low-intensity eccentric contractions with and without blood flow restriction (BFR) on microvascular oxygenation, neuromuscular activation, and the repeated bout effect (RBE). METHODS: Participants were randomly assigned to either low-intensity (LI), low-intensity with BFR (LI-BFR), or a control (CON) group. Participants in LI and LI-BFR performed a preconditioning bout of low-intensity eccentric exercise prior to about of maximal eccentric exercise...
March 21, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28318450/repeated-sprints-in-fasted-state-impair-reaction-time-performance
#16
Anissa Cherif, Romain Meeusen, Abdulaziz Farooq, Walid Briki, Mohamed Amine Fenneni, Karim Chamari, Bart Roelands
OBJECTIVE: The aim of this study was to assess the effects of 3-day Islamic intermittent fasting (3d-IF) on cognitive performance and serum levels of neurotrophic factors (brain-derived neurotrophic factor [BDNF] and vascular endothelial growth factor [VEGF]) before and after repeated sprints. METHODS: Twenty-one physically active male Muslims (29.8 ± 5.9 years, exercising 4 ± 1.5 times/week) were randomly assigned to one of 2 experimental sessions: the control or nonfasting session (CS) or the fasting session (FS)...
March 2017: Journal of the American College of Nutrition
https://www.readbyqxmd.com/read/28302573/stair-walking-is-more-energizing-than-low-dose-caffeine-in-sleep-deprived-young-women
#17
Derek D Randolph, Patrick J O'Connor
INTRODUCTION: The acute energizing effect of exercise and caffeine has never been examined in a single study of adults with chronic sleep deprivation but evidence from a study of this type could help individuals choose between these two common alertness-enhancing options. AIM: The apriori primary aim of this experiment was to compare the influence of 10-min of low-to-moderate intensity stair walking to the consumption of capsules containing 50mg caffeine or flour (placebo) on feelings of energy in physically active, college female caffeine users with chronic insufficient sleep...
March 14, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28291744/consequences-of-short-interruptions-of-bouts-walking-on-estimates-of-compliance-to-physical-activity-guidelines
#18
Juliet Ann Harvey, Danny Rafferty, Sebastien François Martin Chastin
Current guidelines on physical activity suggest that 30 min of moderate intensity physical activity can be accumulated in continuous bouts of at least 10 min. It has been shown by use of activity monitoring that it is difficult to achieve 10 min of completely uninterrupted walking in the free-living urban environment where we have obstacles such as roads to cross. The aim of this study was to examine the effect of short interruptions in walking on the rate of oxygen uptake (ml · kg · min(-1)) to determine if walking with short interruptions can still be considered continuous...
May 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28247026/one-night-of-partial-sleep-deprivation-impairs-recovery-from-a-single-exercise-training-session
#19
Dale E Rae, Tayla Chin, Kagiso Dikgomo, Lee Hill, Andrew J McKune, Tertius A Kohn, Laura C Roden
PURPOSE: The effects of sleep deprivation on physical performance are well documented, but data on the consequence of sleep deprivation on recovery from exercise are limited. The aim was to compare cyclists' recovery from a single bout of high-intensity interval training (HIIT) after which they were given either a normal night of sleep (CON, 7.56 ± 0.63 h) or half of their usual time in bed (DEP, 3.83 ± 0.33 h). METHODS: In this randomized cross-over intervention study, 16 trained male cyclists (age 32 ± 7 years), relative peak power output (PPO 4...
February 28, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28228584/high-cardiorespiratory-fitness-in-early-to-late-middle-age-preserves-the-cortical-circuitry-associated-with-brain-heart-integration-during-volitional-exercise
#20
Katelyn N Wood, Torri A Luchyshyn, J Kevin Shoemaker
This study tested the hypothesis that high cardiorespiratory fitness (peak oxygen uptake) preserves the cortical circuitry associated with cardiac arousal during exercise in middle- to older-aged individuals. Observations of changes in heart rate (HR) and in cortical blood oxygenation level-dependent (BOLD) images were made in 52 healthy, active individuals (45-73 yr; 16 women, 36 men) across a range of fitness (26-66 ml·kg(-1)·min(-1)). Seven repeated bouts of isometric handgrip (IHG) at 40% maximal voluntary contraction force were performed with functional magnetic resonance imaging at 3 T, with each contraction lasting 20 s and separated by 40 s of rest...
April 1, 2017: Journal of Neurophysiology
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